Look at the rules tab to see how you can get promoted. When you reach a certain rank your promotion requirements change from that of the rules page. Look down on the ranks below and the change for that rank will be to the right of it. The Blue numbers beside the ranks means how many members can hold that rank. The colors beside the ranks are only for the Halo 4 branch. (Ranks are not given, they are earned.)
Ranks
Enlisted
Recruit- Khahki
Apprentice- Green
Private- Brick
Lance Corporal- Peach
Corporal- Orange
Sergeant- Yellow
Gunnery Sergeant- Rust (Must now recruit 4 players from now on)
Master Sergeant- Forest (Must now get 4 MVP's from now on)
Sergeant Major- Olive
Master Chief Petty Officer- Sage (Must now recruit 5 players from now on)
Warrant Officer-Cyan (Must now get 4 MVP's from now on)
Chief Warrant Officer-Teal 8
Officer
Lieutenant- Violet (Must now get 5 MVP's)
Lieutenant Commander- Maroon (Must now get 6 MVP's from now on)
Commander- Orchid
Captain- Blue (Must now recruit 6 players, and get 7 MVP's from now on) 6
Major- Lavender 5
Lieutenant Colonel- Cobalt (Must now get 8 MVP's from now on) 4
Colonel- Silver (Must take Leadership test to be this rank) 3
Rear Admiral- Aqua (Must have recruited 10 players while the rank of Colonel and had a staff or senior staff job) 2
Vice Admiral- Gold 2
Admiral- Ice 1
Recruit- Khahki
Apprentice- Green
Private- Brick
Lance Corporal- Peach
Corporal- Orange
Sergeant- Yellow
Gunnery Sergeant- Rust (Must now recruit 4 players from now on)
Master Sergeant- Forest (Must now get 4 MVP's from now on)
Sergeant Major- Olive
Master Chief Petty Officer- Sage (Must now recruit 5 players from now on)
Warrant Officer-Cyan (Must now get 4 MVP's from now on)
Chief Warrant Officer-Teal 8
Officer
Lieutenant- Violet (Must now get 5 MVP's)
Lieutenant Commander- Maroon (Must now get 6 MVP's from now on)
Commander- Orchid
Captain- Blue (Must now recruit 6 players, and get 7 MVP's from now on) 6
Major- Lavender 5
Lieutenant Colonel- Cobalt (Must now get 8 MVP's from now on) 4
Colonel- Silver (Must take Leadership test to be this rank) 3
Rear Admiral- Aqua (Must have recruited 10 players while the rank of Colonel and had a staff or senior staff job) 2
Vice Admiral- Gold 2
Admiral- Ice 1